iOS语音合成（仅支持英文）

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苹果公司在iOS7中推出了语音合成的技术，无需网络环境也可以实现语音合成。

iOS7语音合成的主要的API如下：

1、AVSpeechUtterance，是语音合成的基本单位，它封装影响语音合成的需要的一些参数：语音、语调、语速和延迟等。

2、AVSpeechSynthesisVoice，是语音合成中的Voice对象，它主要包括语音和地区两个方面。

3、AVSpeechSynthesizer，语音合成器的管理类，通过speakUtterance:方法管理AVSpeechSynthesizer。

4、AVSpeechSynthesizerDelegate，是AVSpeechSynthesizer的委托协议。

#import "DemoVC36.h"#import <AVFoundation/AVFoundation.h>@interface DemoVC36 ()<AVSpeechSynthesizerDelegate,UITextViewDelegate>@property (weak, nonatomic) IBOutlet UITextView *textView;@property (weak, nonatomic) IBOutlet UISlider *slider;@property (nonatomic, strong) AVSpeechSynthesizer *speechSynthesizer;@end@implementation DemoVC36- (void)viewDidLoad {    [super viewDidLoad];    //为TextView    [self.textView.layer setBorderWidth:0.5f];    [self.textView.layer setBorderColor:[UIColor grayColor].CGColor];    [self.textView setDelegate:self];    self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];    self.speechSynthesizer.delegate = self;}-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{    BOOL retval = TRUE;    if ([text isEqualToString:@"\n"]) {        [self.textView resignFirstResponder];        retval = FALSE;    }    return retval;}- (IBAction)speakButtonWasPressed:(UIButton *)sender {    NSString *str = @"wei fang is a handsome man";    AVSpeechUtterance *utt = [AVSpeechUtterance speechUtteranceWithString:str];    utt.rate = [self.slider value];    [self.speechSynthesizer speakUtterance:utt];}- (IBAction)speechSpeedShouldChange:(id)sender {    UISlider *slider = (UISlider *)sender;    NSInteger val = round(slider.value);    NSLog(@"%@",[NSString stringWithFormat:@"%ld",val]);}#pragma mark--AVSpeechSynthesizerDelegate-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didStartSpeechUtterance:(AVSpeechUtterance *)utterance{    NSLog(@"语音合成开始");}-(void)speechSynthesizer:(AVSpeechSynthesizer *)synthesizer didFinishSpeechUtterance:(AVSpeechUtterance *)utterance{    NSLog(@"语音合成完成");}@end

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